Boiler-furnace



(Model) J. MAILER.

BOILER FURNAOE.

,080. Patented Sept. 13,1881.

OD 'QO' o 000 0 00 o oo o-o o- -OO O e see 6% see as INVENTOR:

- WITNESSES:

ATTORNEYS.

' BPS.

' UNITED STATES PATENT OFFICE.

JOHN MAILER, OF SAN FRANCISCO, UALIFORNIA.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 247,080, dated September 13, 1881.

I Application filed June 4, 1881. (Model.)

To all whom it may concern Be it known that I. JOHN MAILER, of San Francisco, in the county of San Francisco and State of California, have invented a new and useful Improvement in Boiler-Furnaces, of which the following is a specification.

This invention is designed as an improvement upon the boiler fire-box for which Letters Patent No. 227,278 were issued to me May 4, 1880; and its object is to still further assure the complete combustion of the fuel and gases in the fire-boxes of steam-boilers, evaporators, 85c.

Figure 1 is a sectional front elevation on line :r w of Fig. 2, showing the application of my improved device to a pair of multitubular boil- Fig. 2 is a sectional side elevation of the same on line y y, Fig. 1. Fig. 3 is an elevation of the inside of the fire-chamber door. Fig. 4 is an enlarged front elevation, showing some of my perforated fire-bridge blocks.

Similar letters of reference indicate corresponding parts.

In the drawings, A A represent a pair of stationary cylindrical boilers set in brick-work B. 0 represents the fire box or chamber; 0, the ash-pit D, the combustion-chamber on the opposite side of the bridge-wall from the fire- -perforations, a (1, extending from front to rear thereof, through which the smoke and gaseous products of combustion pass from fire-chamber O to combustion-chamber D. By the passage of these products of combustion through the perforators a a the walls of the latter become highly heated and radiate their heat upon the former, the temperature of which is thereby so increased that their complete combustion in the chamber D is assured when mingling with the air introduced throughthe perforated pipes G, laid in the supplementary bridge-walls H l in the said chamber D.

The perforated portion of the bridge-wall E may be constructed of fire-brick laid with suitable spaces between them; or it may be built up with a mixture of fire-clay, salt, and sand, through which plugs of wood are inserted at suitable intervals, so that when a fire is built in the fire-chamber O the plugs will burn out, while the wall becomes hardened, thereby leaving the suitable perforations a a.

The furnace or fire-chamber door M has its front perforated, as shown at 0, and its lining perforated, as shown at d, and screwed or otherwise secured in the perforations d are short tubes f, (abput two inches long,) that project inward toward the door-front. \Vhen there is a fire'in the fire-chamber 0 these tubes f become very hot therefrom and elevate the temperature of the air passing through the door M into said fire-chamber O, and said tubes f, bein g numerous and of thick metal, retain heat, so that they do not become much reduced in temperature when the door M is opened for replenishing the fires.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- In a boiler-furnace, the perforated doorM, provided with the air-tubes f, in combination with the bridge-Wall having perforations a, as shown and described.

JOHN MAILER.

Witnesses HENRY COUBROUGH, DAVID MILLER. 

